﻿// MIT License
// 
// Copyright (c) 2016 Wojciech Nagórski
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;

namespace ExtendedXmlSerialization.Cache
{
    public sealed class AllInterfaces
    {
        readonly Func<Type, IEnumerable<Type>> selector;

        public static AllInterfaces Instance { get; } = new AllInterfaces();
        AllInterfaces()
        {
            selector = Yield;
        }

        public IEnumerable<Type> Yield( Type parameter ) =>
            new[] { parameter }
                .Concat( parameter.GetTypeInfo().ImplementedInterfaces.SelectMany( selector ) )
                .Where( x => x.GetTypeInfo().IsInterface )
                .Distinct();
    }
}